199999008 has 72 divisors (see below), whose sum is σ = 620461296. Its totient is φ = 60604800.

The previous prime is 199999001. The next prime is 199999043. The reversal of 199999008 is 800999991.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (199999001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28398 + ... + 34733.

It is an arithmetic number, because the mean of its divisors is an integer number (8617518).

Almost surely, 2^199999008 is an apocalyptic number.

199999008 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

199999008 is an abundant number, since it is smaller than the sum of its proper divisors (420462288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199999008 is a wasteful number, since it uses less digits than its factorization.

199999008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63158 (or 63147 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The square root of 199999008 is about 14142.1005511911. The cubic root of 199999008 is about 584.8025807658.

The spelling of 199999008 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, eight".